Data Science

caret

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Point out the wrong statement.
Simple random sampling of time series is probably the best way to resample times series data.
Three parameters are used for time series splitting
Horizon parameter is the number of consecutive values in test set sample
All of the mentioned
Explanation:
Simple random sampling of time series is probably not the best way to resample times series data.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following model model include a backwards elimination feature selection routine?
MCV
MARS
MCRS
All of the mentioned
Explanation:
MARS stands for Multivariate Adaptive Regression Splines.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
The function preProcess estimates the required parameters for each operation.
True
False
Explanation:
predict.preProcess is used to apply them to specific data sets.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Point out the correct statement.
Asymptotics are used for inference usually
Caret includes several functions to pre-process the predictor data
The function dummyVars can be used to generate a complete set of dummy variables from one or more factors
All of the mentioned
Explanation:
The function dummyVars takes a formula and a data set and outputs an object that can be used to create the dummy variables using the predict method.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which of the following function is a wrapper for different lattice plots to visualize the data?
levelplot
featurePlot
plotsample
none of the mentioned
Explanation:
featurePlot is used for data visualization in caret.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following function tracks the changes in model statistics?
varImp
varImpTrack
findTrack
none of the mentioned
Explanation:
GCV change value can also be tracked.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
varImp is a wrapper around the evimp function in the _______ package.
numpy
earth
plot
none of the mentioned
Explanation:
The earth package is an implementation of Jerome Friedman’s Multivariate Adaptive Regression Splines.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
caret does not use the proxy package.
True
False
Explanation:
caret uses the proxy package.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which of the following function can be used to flag predictors for removal?
searchCorrelation
findCausation
findCorrelation
none of the mentioned
Explanation:
Some models thrive on correlated predictors.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following package tools are present in caret?
pre-processing
feature selection
model tuning
all of the mentioned
Explanation:
There are many different modeling functions in R.